Sewing machine



FIG. 1 is a front perspective view of a sewing machine, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 if a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in the drawings are included to show unclaimed subject matter only and form no part of the claimed design. 

CLAIM The ornamental design for a sewing machine, as shown and described. 